/**
* Relational pipes
* Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <memory>
#include <string>
#include <vector>
#include <iostream>
#include <sstream>
#include <locale>
#include <codecvt>
#include <stdexcept>
#include <relpipe/reader/typedefs.h>
#include <relpipe/reader/TypeId.h>
#include <relpipe/reader/handlers/RelationalReaderStringHandler.h>
#include <relpipe/reader/handlers/AttributeMetadata.h>
#include "Configuration.h"
namespace relpipe {
namespace out {
namespace x11 {
using namespace relpipe;
using namespace relpipe::reader;
using namespace relpipe::reader::handlers;
class X11Handler : public RelationalReaderStringHandler {
private:
std::ostream& output;
Configuration& configuration;
const char QUOTE = '"';
std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: probably not needed
std::vector<AttributeMetadata> firstAttributes;
integer_t valueCount = 0;
public:
X11Handler(std::ostream& output, Configuration& configuration) : output(output), configuration(configuration) {
}
void startRelation(string_t name, std::vector<AttributeMetadata> attributes) override {
if (firstAttributes.empty()) {
firstAttributes = attributes;
if (configuration.writeHeader) for (auto attr : attributes) attribute(attr.getAttributeName());
} else {
throw std::logic_error("Only a single relation can be converted to the X11 format.");
}
}
void attribute(const string_t& value) override {
valueCount++;
if (value.size() > 0) {
output << QUOTE;
for (auto ch : convertor.to_bytes(value)) {
if (ch == QUOTE) output << QUOTE << QUOTE;
else output << ch;
}
output << QUOTE;
}
if (valueCount % firstAttributes.size()) {
output << ",";
} else {
output << "\r\n";
valueCount = 0;
}
}
void endOfPipe() {
output.flush();
}
};
}
}
}